I have a wireless microsoft router. MP-700 or something. I have 3 wireless computers hooked to it, and 1 hard wired. My hard wired one is displaying two MAC addresses. It's kinda wierd. I used MAC filtering option, to prevent people from tagging onto my network. What I noticed was, that I took the MAC from my Realtek Ethernet Card, and put that in the allow list, and from there I was able to get files from other computers, if I manually punched in the computers server name. But I couldn't browse the computers, through the "View Workgroup Computers" option. However, all the other PCs on the network can view my files, through the v"iew network computers" button. So what I did was, turned off MAC filtering. I was able to browse on this wired comp now. But I still wanted filtering, so then, I allowed both MAC Addresses coming from this comp. Hhhhm, I can still browse! But why are there two, I don't want two! I didn't have two back in the wired days! My concern is if I add more wired computers, the filtering process will get quite wieldy if all the comps have two MACs. I'd also like to note that all the wireless MACs start with 00 for the first two digits. My Realtek ethernet starts with F2. However, my "mystery" MAC address starts with the 00. Is the router making me a second MAC? Thanks if you can help!